278 THE ROYAL SOCIETY OF CANADA 



(b) Quantitative measurements. 



Martin: Proc. Roy. Soc. Canada, 7, III., 219 (1913)— the first defin- 

 ite experimental evidence that liquids or indeed that any dust- 

 free media scatter light. 



R. J.Strutt: Proc. Roy. Soc, 95A, 155 (1919) — a measurement of 

 the light scattered by liquid ether is given. 



Martin: Jour. Phys. Chem., 24, 478 (1920) — -quantitative measure- 

 ments of relative intensity. 



Martin and Lehrman: Jour. Phys. Chem., 26, 75 (1922); Proc. 

 Roy. Soc. Canada, 15, 50 (1921) — -measurements of absolute 

 intensity; two-component liquid mixtures. 



Kenrick: Jour. Phys. Chem., 26, 72 (1922)— note on Wolski's paper. 



Raman: Nature, 109, 75 (1922); Proc. Roy. Soc, 101 A, 64(1922); 

 Molecular Diffraction of Light. University of Calcutta (1922) — 

 preliminary notes on some work now in progress. 



C. Solids. 



R. J. Strutt: Proc. Roy. Soc, 95A, 476 (1919)— light scattered by 



quartz crystals, calcite crystals and glass. 

 Raman: Nature, 109, 42 (1922) — -light scattered by quartz crystals. 



Ibid., 109, 138 (1922)^ — -light scattered by amorphous solids — -glass 



in particular. 



4. CRITICAL OPALESCENCE. That gases, and also two- 

 component liquid solutions of critical composition, scatter a very 

 large amount of light even at some distance above the critical tem- 

 perature has been observed by many investigators. 



A. Experimental data. 



Avenarius: Pogg. Ann., 151, 306 (1874). 



Guthrie: Phil. Mag., (5) 18, 504 (1884). 



Wesendonck: Zeit. Phys. Chem., 15, 262 (1894). 



Rothmund: Zeit. Phys. Chem., 26, 433 (1898); 63, 54 (1908). See 



this last paper for review of work on binary liquid mixtures. 

 Friedlander: Zeit. Phys. Chem., 38, 385 (1901). 

 Fuchtbauer: Zeit. Phys. Chem., 48, 552 (1904). 

 Travers and Usher: Proc. Roy. Soc, 78A, 247 (1906), republished 



in Zeit. Phys. Chem., 57, 365 (1907)— best review of critical 



opalescence in gases. 

 Young: Phil. Mag., (6) 20, 793 (1910). 

 Kamerlingh-Onnes and Keesom: Comm. from the Phys. lab. at 



Leiden, No. 104b., republished in Amst. Proc, 10, 611 (1908), 



also in Ann. der Phys., 35, 591 (1911). In this paper the opales- 



